Since you don't tell us what year or make car, I can only answer generally. Knock is caused by either having the timing too advanced or too low octane..... If it didn't use to knock, then try retarding the timing a few degrees.
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Since you don't tell us what year or make car, I can only answer generally. Knock is caused by either having the timing too advanced or too low octane..... If it didn't use to knock, then try retarding the timing a few degrees.